Add _Fn to undocumented function typedefs in Mat

Commit-type: housekeeping

Consolidate Mat code deriving from MATSHELL

Add missing interface function MatProductGetAlgorithm()

MatNullSpaceTest: fix output

Merge branch 'jolivet/enable-ubsan' into 'main'

Proper UBSan suppression file and last fixes

See merge request petsc/petsc!7166

Added MatMultHermitianTranspose and MatMultHermitianTransposeAdd for MATSCALAPACK

Added MatMultHermitianTranspose and MatMultHermitianTransposeAdd for MATDENSECUPM

Added MatMultHermitianTranspose and MatMultHermitianTransposeAdd for MATSEQDENSE and MATMPIDENSE

Important fixes

New "Extra comma in test harness rules" in checkbadSource

Fix "Extra spaces in test harness rules" in checkbadSource

First batch of fixes

Modified ex88 to test MatMultHermitianTranspose_Shell and MatMultHermitianTransposeAdd_Shell and to test with complex numbers

Add support for MatMultHermitianTranspose with a shell matrix

Merge remote-tracking branch 'origin/release'

Update references in the manual pages to use Sphinx citation processing

Merge remote-tracking branch 'origin/release'

Fix bug if MatDuplicate() is called on a MatSetUp() but not MatAssembly matrix

Reported-by: Benjamin Sturdevant <bsturdev@pppl.gov>
Reported-by: Mark Adams <mfadams@lbl.gov>

Merge remote-tracking branch 'origin/release'

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptio

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptionsGetViewer(). In the previous code PetscObjectReference() and
dereference (via PetscViewerDestroy() where called on the viewer by multiple threads after the viewer
was accessed thus corrupting the object.

This branch introduces a PetscOptionsRestoreViewer() that allows not doing the referencing and dereferencing
on persistant viewers, thus removing the specific race condition above.

Other possible solutions include

Use a lock on each PetscObjectReference/Dereference() just in case they are shared. Could be time consuming so one
could mark each object as either threadshared or independent and only do the locks on threadshared objects. This lowers
the cost but would require more extensive changes to PETSc infrastructure. And I do not know if this shared/not shared model
is what we need in the long run, though it might be.

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Add Fortran stubs and interfaces for MatSetValuesLocal()

Merge branch 'jolivet/feature-matmatmult-mpidense-mpidense' into 'main'

MatMatMult_MPIDense_MPIDense without Elemental

See merge request petsc/petsc!7067

MatProduct_AB for mpidense-mpidense without Elemental

Remove useless code and misc fixes

Tests: test MatShift() on matrices with either dense or sparse diagonal